Dezdemona, I guess they've thought you'd grow out of it, huh? Hey, I have a lesbian friend who has been with her partner for nearly ten years. Anyway, we were friends before then, and I remember her mother thinking that she'd grow out of it, and secretly (or not-so-secretly) wishing my friend would find the right man.
Anyway, years on, she has accepted that her daughter is gay, and embraced my friend's partner as part of the family. People's attitudes can change. So there's hope for you and your family
Sorry to hear about your uncle, though ... I reckon he'd be difficult to deal with. Try and stay out of his way when he's around.
Have fun at the Pride Festival. Perhaps when you're there, you can investigate some support and social groups for lesbians.